QDBusPendingCall Class
The QDBusPendingCall class refers to one pending asynchronous call. More...
| Header: | #include <QDBusPendingCall> |
| qmake: | QT += dbus |
| Since: | Qt 4.5 |
| Inherited By: |
This class was introduced in Qt 4.5.
Public Functions
| QDBusPendingCall(const QDBusPendingCall &other) | |
| QDBusPendingCall & | operator=(const QDBusPendingCall &other) |
| ~QDBusPendingCall() | |
| void | swap(QDBusPendingCall &other) |
Static Public Members
| QDBusPendingCall | fromCompletedCall(const QDBusMessage &msg) |
| QDBusPendingCall | fromError(const QDBusError &error) |
Detailed Description
A QDBusPendingCall object is a reference to a method call that was sent over D-Bus without waiting for a reply. QDBusPendingCall is an opaque type, meant to be used as a handle for a pending reply.
In most programs, the QDBusPendingCall class will not be used directly. It can be safely replaced with the template-based QDBusPendingReply, in order to access the contents of the reply or wait for it to be complete.
The QDBusPendingCallWatcher class allows one to connect to a signal that will indicate when the reply has arrived or if the call has timed out. It also provides the QDBusPendingCallWatcher::waitForFinished() method which will suspend the execution of the program until the reply has arrived.
Note: If you create a copy of a QDBusPendingCall object, all information will be shared among the many copies. Therefore, QDBusPendingCall is an explicitly-shared object and does not provide a method of detaching the copies (since they refer to the same pending call)
See also QDBusPendingReply and QDBusPendingCallWatcher.
Member Function Documentation
QDBusPendingCall::QDBusPendingCall(const QDBusPendingCall &other)
Creates a copy of the other pending asynchronous call. Note that both objects will refer to the same pending call.
QDBusPendingCall &QDBusPendingCall::operator=(const QDBusPendingCall &other)
Creates a copy of the other pending asynchronous call and drops the reference to the previously-referenced call. Note that both objects will refer to the same pending call after this function.
If this object contained the last reference of a pending asynchronous call, the call will be canceled and no further notifications will be received. There will be no way of accessing the reply's contents when it arrives.
QDBusPendingCall::~QDBusPendingCall()
Destroys this copy of the QDBusPendingCall object. If this copy is also the last copy of a pending asynchronous call, the call will be canceled and no further notifications will be received. There will be no way of accessing the reply's contents when it arrives.
[static] QDBusPendingCall QDBusPendingCall::fromCompletedCall(const QDBusMessage &msg)
Creates a QDBusPendingCall object based on the message msg. The message must be of type QDBusMessage::ErrorMessage or QDBusMessage::ReplyMessage (that is, a message that is typical of a completed call).
This function is useful for code that requires simulating a pending call, but that has already finished.
This function was introduced in Qt 4.6.
See also fromError().
[static] QDBusPendingCall QDBusPendingCall::fromError(const QDBusError &error)
Creates a QDBusPendingCall object based on the error condition error. The resulting pending call object will be in the "finished" state and QDBusPendingReply<T1, T2, T3, T4, T5, T6, T7, T8>::isError() will return true.
This function was introduced in Qt 4.6.
See also fromCompletedCall().
void QDBusPendingCall::swap(QDBusPendingCall &other)
Swaps this pending call instance with other. This function is very fast and never fails.
This function was introduced in Qt 5.0.
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